/*案例一*/
	传值：
	Intent intent=new Intent();
	intent.putExtra("extra", "这是页面一传来的值！");
	intent.setClass(Test_for_intentActivity.this, actpage2.class);
	startActivity(intent);
	
	取值：
	Intent intent=getIntent();
	String StringE=intent.getStringExtra("extra");
	TextView text2=(TextView)findViewById(R.id.textView2);
	text2.setText(StringE);
	
/*打开网页*/
	Uri uri = Uri.parse("http://www.google.com");
	Intent it  = new Intent(Intent.ACTION_VIEW,uri);
	startActivity(it);
	
/*拨打电话*/
	Uri uri =Uri.parse("tel:xxxxxx");
	Intent it = new Intent(Intent.ACTION_DIAL,uri);  
	startActivity(it); 
	
/*调用发短信的程序*/
	Intent it = newIntent(Intent.ACTION_VIEW);   
	it.putExtra("sms_body", "TheSMS text");   
	it.setType("vnd.android-dir/mms-sms");   
	startActivity(it);
	
/*发送附件*/
	Intent it = new Intent(Intent.ACTION_SEND);  
	it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");  
	it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/eoe.mp3");  
	sendIntent.setType("audio/mp3");  
	startActivity(Intent.createChooser(it, "Choose Email Client"));